As shown in the illustration of a...

Question 1 / 205eccefa4bacbc34ba4d485ed

Question 1 of 205eccefa4bacbc34ba4d485ed

As shown in the illustration of a turbo-electric propulsion drive system, in terms of motor speed and direction control, what statement is true? See illustration EL-0142.

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Question 1 of 20

5eccefa4bacbc34ba4d485ed

As shown in the illustration of a turbo-electric propulsion drive system, in terms of motor speed and direction control, what statement is true? See illustration EL-0142.

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🔍 Key Concepts

• Look at how the propulsion generator field is controlled by the exciter and what that does to voltage vs. frequency coming from the turbo‑generator. • Notice the reversing lever and the F/F and R/R contactors between the generator and main propulsion motor – think about what that means for a three‑phase AC motor’s direction of rotation. • Recall the basic rule: for a synchronous or induction AC motor, what mainly sets its speed and what actually changes when you throttle the prime mover driving the generator.

💭 Think About

• From the illustration, does the turbine throttle primarily change the generator’s field excitation or its rotational speed, and which of those controls output frequency? • In a three‑phase propulsion motor, do we normally reverse direction by changing the field polarity or by changing the phase sequence of the stator supply, and which option in the answers reflects that? • If the exciter is regulating the generator field, is that mainly keeping voltage constant while speed (and thus frequency) is varied, or is it mainly varying voltage at a fixed frequency?.

✅ Before You Answer

• Confirm that the reversing lever is wired to switch the phase leads (F/F and R/R) between generator and motor, indicating phase sequence reversal for ahead/astern. • Confirm that the speed regulating governor is mechanically linked to the turbine and thus changes the generator speed and frequency, not the generator field strength. • Verify which option matches: speed tied primarily to frequency control (via turbine speed) with the exciter used to regulate voltage, and direction achieved by reversing phase sequence, not field polarity.

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Question 1 of 20

As shown in the illustration of a turbo-electric propulsion drive system, in terms of motor speed and direction control, what statement is true? See illustration EL-0142.

the motor speed is controlled by varying voltage and frequency and the direction is controlled by reversing the polarity of the motor field

the motor speed is controlled by varying voltage, but keeping the frequency constant and the direction is controlled by phase sequence reversal

the motor speed is controlled by varying frequency, but keeping the voltage constant and the direction is controlled by phase sequence reversal

the motor speed is controlled by varying voltage and frequency and the direction is controlled by phase sequence reversal

Question 1 / 205eccefa4bacbc34ba4d485ed

Question 1 of 205eccefa4bacbc34ba4d485ed

As shown in the illustration of a turbo-electric propulsion drive system, in terms of motor speed and direction control, what statement is true? See illustration EL-0142.

Back

Question 1 of 20

5eccefa4bacbc34ba4d485ed

As shown in the illustration of a turbo-electric propulsion drive system, in terms of motor speed and direction control, what statement is true? See illustration EL-0142.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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